Fluid-pressure brake.



W. V. TURNER.

FLUID PRESSURE BRAKE.

APPLIOATION FILED JUNE 19, 1909.

1,076,723, Patented 0ct.28,1913.

WITNESSES Acty.

CQLUMBIA PLANOGRAPH LEO-.WASIHNGTON, D. C4

UNI. ED STACEliSJZgEYENqj OFFICE.

WALTER, V. TURNER, OF EDG-EVJOOD, PENNSYLVANIA, ASSIGNOR TO THEGWESTING HOUSE AIR-BRAKE CUMPANY, 01* PITTSBUEG-I-I, PENNSYLVANIA, A CORPORATION OF. PENNSYLVANIA.

IELUID-PRESS To all to/tom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the UnitedStat-es, residing at Edgewood, in thecounty or Allegheny and State of Pennsylvania, have invented new and useful Improvements in l uid-Pressure Brakes, of which the following is a specification.

This invention relates to fluid pressure brakes, and more particularly to means for controllingau outlet from thebrakc cylinder through a blow down valve to the atmos- 'phere in applying the b 21.1168.

is a sectional view of a triple valve device and blow down valve attached thereto cmbodying my improvement; and lFig. 2 a fragmentary sectional view of a modified construction embodying my invention.

According to Fig. 1 of the drawing, the

triple valve device may be of the usual construction comprising a casing 1, having a train pipeconnection 2, piston 3, main slide valve 41 and graduating valve 5., the valve chamber 6 being open to the auxiliary reservoir in the usual manner. The triple valve shown is also provided with an emergency piston 7 for controlling the usual train pipe vent valve 8 adapted to vent air from the train pipe to the brake cylinder in an emergency application of the brakes. Emergency pOTt 9 leads from the main slide valve seat to the chamber above the emergency pis ten 7 and the main slide valve is provided with ports 10 and 11 for respectively registering with the brake cylinder port 12 and exhaust port 13 in release position, when cavity 1 1 in the graduating valve 5 connects said ports. The main slide valve also has the usual service port 16. According to my improvement, a port 17 in the casing 1, leading from the brake cylinder passage 19, is

Specification of Letters Patent.

Application filed June 19, I909.

URE BRAKE.

Patented Oct. 28, .1913.

Serial No. 503,125.

adapted'to communicate with a chamber 18 containing valve piston :20 which controls communication from passage 17 to chamber 18 communicating with a safety valve dee vice 21, of any desired construction. The chamber 29 atthe opposite side of the valve pistonQO is open to a passage 23 leading to the emergency piston 7, and so positioned a spring 2% maintains the valve piston 20 in; position with communication open from the brake cylinder passage 17 to the safety valve 21, so that inscrvice applications of the @brakes, the fluid under pressure in the brake {cylinder is free to flow to the safety valve land the same operates to blow elf the pres- :sure in excess of the predetermined degree i'at which thesafety valve is adjusted. In an ien'iergency application, however, the triple valve pistonmoves out to emergency posi- }tion and opens the emergency port 9 to the auxiliary reservoir, so that fluid therefrom flows to and operates the emergency piston 7 in the usual manner.

The movement of the emergency piston 7 opens up coimnuni The valve piston 20 is therebyshiftcd and closes the communicationfrom brake cylinder passage 17 to the safety valve. Inthis position communication is also opened from passage 23 to passage 17, a port extension of the passage 17 being provided for that" purpose. Fluid from the auxiliary reservoir may thus flow from the passage 23 through passage 17 to the brake cylinder, to

effect an emergency application of the brakes. In its seated position, closing communication to the safety valve, the valve piston 20 is subject to the pressure in the brake cylinder on its outer face and is thereby held in said position, until the brakes are released, when, the brake cylinder pressure having been exhausted to the atmosphere, the spring 2 1 will return the valve piston 20 to its normal open position.

In Fig. 2 of the drawing another con struction embodying my improvement is illustrated in which a piston 80 is provided and a valve 31 operated thereby for controlling eommunication from chamber 32,

having a passage 33 leading to the brake cylinder, to passage 34, in open communica tion with the safety valve. A passage leads from the chamber 36 above the piston 30 to the seat of the triple valve slide valve and said passage is adapted to be connected in release and service application positions with the exhaust port, while in emer gencyapplications the same is opened to the auxiliary reservoir. It will now be evident that in service applications, air from the brake cylinder has free access to the safety valve by way of passages 33 and 34, whilein emergency applications, the admission of fluid under pressure from the auxiliary reservoir to the piston 30 operates the same to close the valve 31 and cut oil communication from the brake cylinder to the safety valve. A port 37 is provided around piston 30, so that when said piston is shifted from its seat in an emergency application, communication is opened from chamber 36 to chamber 32 and fluid from the auxiliary reservoir is thereby admitted to the brake cylinder by way of the passage 33. If desired, the movement of piston 30 in emergency applications may be employed to operate a by-pass valve 38, adapted to open communication from a passage 39 leading to a supplementary reservoir or other additional source of pressure to a passage 40, connected with the auxiliary reservoir.

In order to insure the tight and uniform seating of the valve 31, the same may be constructed as shown in the drawing, the port opening l1 to the safety valve port 34 being inclosed between annular seating rings upon which the valve 31 is adapted to seat. The valve 31 is loosely mounted on the valve stem 42 and a pressure spring 43 is interposed between the piston 30 and the valve 31, so that said valve is adapted to yieldingly adjust itself to its seat, as will be apparent.

Having now described my invention, what I claim as new anddesire to secure by Letters Patent, is

1. In a fluid pressure brake, the combina tion with a blow down valve, of a valve piston for controlling the outlet from the brake cylinder through said blow down valve, and normally maintaining said outlet open and means subject to variations in train pipe pressure for supplying fluid under pressure to one side of said valve piston to cut off the communication through said blow down valve. 7

2. In a fluid pressure brake, the combination with a triple valve device subject to variations in train pipe pressure, of a blow down valve and a piston normally subject on one side to brake cylinder pressure and valve means operated thereby for controlling the outlet from the brake cylinder through said blow down valve, a spring normally maintaining said piston and valve means open and means operated by said triple valve device for admitting fluid under pressure to the opposite side of said piston to operate same and thereby said valve means to close the communication from the brake cylinder through said blow down valve.

3. In a fluid pressure brake, the combination with a triple valve device for controlling the supply of air to the brake cylinder, of a blow down valve and means operated by the flow of air from the auxiliary reservoir to the brake cylinder for closing communication from the brake cylinder through said blow down valve.

4. In a fluid pressure brake, the combination with a triple valve device for cont-rolling the supply of air to the brake cylinder, of a blow down valve and means for controlling the outlet from the brake cylinder through said blow down valve and operated by the flow of air from the auxiliary reservoir to the brake cylinder in an emergency application for closing said outlet.

5. In a fluid pressure brake, the combination with a triple valve device having an emergency valve mechanism operated by fluid from the auxiliary reservoir for opening a train pipe vent port in an emergency application of the brakes, of a blow down valve normally open to the brake cylinder and a valve piston operated by the flow of auxiliary reservoir fluid from the emergency piston to the brake cylinder for closing communication from the brake cylinder through said blow down valve.

In testimony whereof I have hereunto set my hand. 7

WALTER V. TURNER. WVitnesses:

W'M. M. GADY, A. M. CLEMENTs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

